As was seen previously Laplace transform is `F(s)=L(f(t))` , in other words we are given function `f(t)` and we need to find `F(s)` . Inverse Laplace transform is operation of finding `f(t)` given `F(s)` .

To find inverse Laplace transform partial fraction decomposition is very useful, but sometimes it can be very difficult to find partial fraction decomposition, so in some cases inverse Laplace transform can be found with the help of convolution integral.